Wireless transmitter and receiver can be used for electroacoustic instruments such as guitar, bass and so on.   Features: UHF 730MHz sound transmission, anti-interface and ultra-short delay, giving you nice music sound.  Supports 4 sets of devices working at same time, one-to-one, and max. transmission range is up to 50 meters.  Wireless transmitter and receiver set for electroacoustic musical instruments like guitar, bass, etc.  Built-in rechargeable lithium battery, long working hours, and comes with USB cable for convenient charge.  Plug and play, simple to use, compact size and lightweight, easy to carry.   Specifications: Color: black;  Material: plastics;  Frequency: 20Hz-20KHz;  Transmission delay: ＜4ms;  Transmitter/receiver size: 110 * 43 * 17mm;  Transmitter battery: 3.7V, 600mAh;  Receiver battery: 3.7V, 600mAh;  Package size: 120 * 85 * 40mm / 4.7 * 3.3 * 1.6in;  Package weight: 125g / 4.4ounce;   Packing List: 1 * Transmitter;  1 * Receiver;  1 * USB Cable